Flatfoot is often a complex disorder, with diverse symptoms and varying degrees of deformity and disability. There are several types of flatfoot, all of which have one characteristic in common: partial or total collapse (loss) of the arch. Other characteristics shared by most types of flatfoot include toe drift, in which the toes and front part of the foot point outward. The heel tilts toward the outside and the ankle appears to turn in. A tight Achilles tendon, which causes the heel to lift off the ground earlier when walking and may make the problem worse, bunions and hammertoes may develop as a result of a flatfoot.
Flexible flatfoot is one of the most common types of flatfoot. It typically begins in childhood or adolescence and continues into adulthood. It usually occurs in both feet and progresses in severity throughout the adult years. As the deformity worsens, the soft tissues (tendons and ligaments) of the arch may stretch or tear and can become inflamed. The term “flexible” means that while the foot is flat when standing (weightbearing), the arch returns when not standing.